[24] Published by permission of the Geological Survey, Ottawa, Ont.
[25] Ridgway’s Color Standards and Nomenclature. 1912.
[26] For the three previous lists see, ‘The Auk,’ XXXIII, October, 1916, pp. 425-431; XXXIV, April, 1917, pp. 198-205; XXXV, April, 1918, pp. 200-217.
[27] Additions to the A. O. U. Check-List, the Sixteenth Supplement, and the First, Second, and Third Annual Lists, are marked with a dagger (†).
[28] Eliminations of forms already in the A. O. U. Check-List, the Sixteenth Supplement, the First, Second or Third Annual Lists, are designated by a star (★).
[29] The writer does not sympathize with the increasing tendency to elevate subgenera (which are often based largely on color characters) to genera, unless diagnostic structural characters are also indicated. A well-marked and useful subgenus may represent a questionablegenus.
[30] ‘The Auk,’ I, No. 3, July, 1884, p. 236.
[31] Rep. Expl. and Surv. R. R. Pac., IX, 1858, p. 734 (type by monotypy, Totanus brevipes Vieillot).
[32] Birds of Australia, III, part 3, 1913, p. 206.
[33] It is interesting in this connection to note that Ridgway (Bird N. and Mid. Amer., II, p. 101) rejects P. erythromelœna Salv. 1868 because of P. erythromelas Vieill. 1819 but does not alter the latter!—Ed.